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Telephone numbering plan of the USSR refers to a set of telephone area codes, numbers and dialing rules, which operated in the Soviet Union until the 1990s. After the Collapse of the USSR many new independent republics reconstructed their numbering plans. However, many of the principles of the Soviet numbering plan still remains. The international code +7 is retained by Russia and Kazakhstan.
The Soviet Union used four-level open numbering plan. The long distance prefix was 8.
One could call a local number without the code. Local numbers usually consisted of 5-7 digits, with seven-digit numbers only occurring in Moscow (since 1968), Leningrad (since 1972) and Kiev (from the late 1970s).
Within the same numbering area (most often within the state or province) the type was: 8 2X YYYYYY, where 2 replaced the three-digit area code.
For calls to other areas, one had to first dial long distance prefix 8, then, after the tone - the full code of the numbering area, which consisted of a three-digit code and zone additional digit(X), and then local phone number.
Area codes with 0 denotes the republics and Oblasts of the European part of the USSR. After the collapse of the Soviet Union, these codes in Russia, Belarus and Ukraine were preserved, with minor changes. Area codes in Ukraine and Belarus later dropped initial 0. In Russia, on December 2005 the leading zero in the Oblastal area codes has been replaced by a 4.